新型降排水强夯加固冲填沉积土地基研究

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英文篇名：Experimental research of new type dewatering-dynamic consolidation in alluvial deposit soil foundation treatment 作者：蔡仙发 ; 唐彤芝 ; 蔡新 ; 吴月龙 ; 刘培贵 ; 叶吉 英文作者：CAI Xianfa;TANG Tongzhi;CAI Xin;WU Yuelong;LIU Peigui;YE Ji;Fujian Geotechnical Engineering Investigation Institute Co.,Ltd.;Nanjing Hydraulic Research Institute;Department of Development Planning,Hohai University;Nantong Coastal Development Group Co.,Ltd.; 关键词：地基 ; 强夯 ; 低位负压组合排水 ; 降水 ; 水气分离集成管井 英文关键词：foundation;;dynamic compaction;;low negative pressure combination drainage;;dewatering;;moisture separator integrated well 中文刊名：FZDZ 英文刊名：Journal of Fuzhou University(Natural Science Edition) 机构：福建岩土工程勘察研究院有限公司;南京水利科学研究院;河海大学发展规划处;南通开发集团城镇建设有限公司; 出版日期：2019-01-09 11:22 出版单位：福州大学学报(自然科学版) 年：2019 期：v.47;No.227 基金：水利部公益性行业科研专项基金(201401006) 语种：中文; 页：FZDZ201901015 页数：7 CN：01 ISSN：35-1117/N 分类号：104-110

摘要

针对地下水丰富、季节性降雨多、降水消压难度大的特点,提出"水气分离集成管井"和"低位负压组合排水结构"新型降排水技术,应用于南通某工程试验区强夯施工,并通过现场监测和试验检测揭示了新型降排水结构的机理特性和功效.结果表明,两项新结构集成了水力释重、真空负压和多通道立体排水等多项降排水机制,均体现出良好的降排水和孔压消散能力,但在降水消压的快慢、夯击能量的深层传递和土体侧向水平位移特性等方面也存在差异,反映了不同结构特点的影响.加固后地基土静力触探ps值增大3～5倍,地基承载力提高1.8～2.2倍,土的物理力学性质和强度指标得到明显改善.
        In view of the rich groundwater,seasonal rainfall,dewatering and dissipating pore water pressure difficult characteristics. Two new drainage technologies,"moisture separator integrated well"and "low negative pressure combination drainage structure",are proposed to be applied to dynamic compaction in an engineering test area in Nantong. The mechanism characteristics and efficiency of the two new drainage structures were studied and revealed through field monitoring and test. Results show that two new structure integrated with hydraulic recharge,vacuum negative pressure and multi-channel stereo drainage mechanism and reflects the good drainage and pore pressure dissipation ability.However,there are also differences in the precipitation elimination speed,deep tamping energy transfer and lateral horizontal displacement of soil properties,etc.,which reflects the influence of different structural characteristics. After reinforcement,the psvalue of cone penetration test is increased by increases 3 to 5 times,and the bearing capacity of the foundation is increased by 1.8 to 2.2 times,and the physical and mechanical properties and strength index of soil are improved obviously.

引文

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